Defining long vowels

[Nieves and Co]

How do you define a long vowel in Hiragana/Katakana?

Thanks in advance!

 

[Toritoribe]

ー(long vowel mark): カード

or

あ列(a-row kana = あかさたなはまやらわ) + あ: かあさん

い列(i-row kana = いきしちにひみり) + い: しいたけ

う列(u-row kana = うくすつぬふむゆる) + う: すうじ

え列(e-row kana = えけせてねへめれ) + え/い: ねえねえ/せいじ（Ｘねいねい/せえじ）

お列(o-row kana = おこそとのほもよろ) + う/お: おうさま[王様]/とおい[遠い]（Ｘおおさま/とうい）


A single kana can't be a long vowel.

Or, are you asking about the difference in pronunciation, e.g., "suuji" v.s. "sūji"?

 

[Nieves and Co]

ー(long vowel mark): カード

or

あ列(a-row kana = あかさたなはまやらわ) + あ: かあさん

い列(i-row kana = いきしちにひみり) + い: しいたけ

う列(u-row kana = うくすつぬふむゆる) + う: すうじ

え列(e-row kana = えけせてねへめれ) + え/い: ねえねえ/せいじ（Ｘねいねい/せえじ）

お列(o-row kana = おこそとのほもよろ) + う/お: おうさま[王様]/とおい[遠い]（Ｘおおさま/とうい）


A single kana can't be a long vowel.

Or, are you asking about the difference in pronunciation, e.g., "suuji" v.s. "sūji"?

Aa! Doomo Arigatou gozaimasu!

Or, are you asking about the difference in pronunciation, e.g., "suuji" v.s. "sūji"?

That too.

Oh and one more question, if you have a word with an odd amount of letters (e.g; watashi, anata, yamette, etc), how would you divide them ('cause wouldn't there be a letter left out)?

 

[Toritoribe]

すうじ is usually pronounced as a long vowel "sūji". However, when it's said slowly syllable by syllable, it would be pronounced as the two syllables "su・u・ji".

Oh and one more question, if you have a word with an odd amount of letters (e.g; watashi, anata, yamette, etc), how would you divide them ('cause wouldn't there be a letter left out)?

What do you mean by "odd amount of"? There's no such letters in your examples. Do you mean "shi", a vowel "a" or sokuon "tte", by any chance? If so, see the explanation in wiki page.